Aggregate lab data for the ROCA soil series. This aggregation is based on all pedons with a current taxon name of ROCA, and applied along 1-cm thick depth slices. Solid lines are the slice-wise median, bounded on either side by the interval defined by the slice-wise 5th and 95th percentiles. The median is the value that splits the data in half. Five percent of the data are less than the 5th percentile, and five percent of the data are greater than the 95th percentile. Values along the right hand side y-axis describe the proportion of pedon data that contribute to aggregate values at this depth. For example, a value of "90%" at 25cm means that 90% of the pedons correlated to ROCA were used in the calculation. Source: KSSL snapshot (updated 2020-03-13). Methods used to assemble the KSSL snapshot used by SoilWeb / SDE
Monthly water balance estimated using a leaky-bucket style model for the ROCA soil series. Monthly precipitation (PPT) and potential evapotranspiration (PET) have been estimated from the 50th percentile of gridded values (PRISM 1981-2010) overlapping with the extent of SSURGO map units containing each series as a major component. Monthly PET values were estimated using the method of Thornthwaite (1948). These (and other) climatic parameters are calculated with each SSURGO refresh and provided by the fetchOSD function of the soilDB package. Representative water storage values (“AWC” in the figures) were derived from SSURGO by taking the 50th percentile of profile-total water storage (sum[awc_r * horizon thickness]) for each soil series. Note that this representation of “water storage” is based on the average ability of most plants to extract soil water between 15 bar (“permanent wilting point”) and 1/3 bar (“field capacity”) matric potential. Soil moisture state can be roughly interpreted as “dry” when storage is depleted, “moist” when storage is between 0mm and AWC, and “wet” when there is a surplus. Clearly there are a lot of assumptions baked into this kind of monthly water balance. This is still a work in progress.
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Sibling Summary
Siblings are those soil series that occur together in map units, in this case with the ROCA series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2024-02-21), parsed OSD records (updated 2023-10-02) and snapshot of SC database (updated 2023-10-02).
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Select annual climate data summaries for the ROCA series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).
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Geomorphic description summaries for the ROCA series and siblings. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom).
Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats.
Proportions can be interpreted as an aggregate representation of geomorphic membership. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Small Shannon entropy values suggest relatively consistent geomorphic association, while larger values suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).
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There are insufficient data to create the 3D flats position figure.
Competing Series
Soil series competing with ROCA share the same family level classification in Soil Taxonomy. Source: parsed OSD records (updated 2023-10-02) and snapshot of the SC database (updated 2023-10-02).
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Select annual climate data summaries for the ROCA series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).
Click the image to view it full size.
Geomorphic description summaries for the ROCA series and competing. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Proportions can be interpreted as an aggregate representation of geomorphic membership.
Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats.
The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Shannon entropy values close to 0 represent soil series with relatively consistent geomorphic association, while values close to 1 suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).
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There are insufficient data to create the 3D hills figure.
Click the image to view it full size.
There are insufficient data to create the 3D terrace figure.
There are insufficient data to create the 3D flats position figure.
Soil series sharing subgroup-level classification with ROCA, arranged according to family differentiae. Hovering over a series name will print full classification and a small sketch from the OSD. Source: snapshot of SC database (updated 2023-10-02).
Block Diagrams
Click a link below to display the diagram. Note that these diagrams may be from multiple survey areas.
Representative detailed soil map units as they occur in various landscape positions. Units 261 (Linkup-Roca-Vanwyper association), 241 (Cleavage-Cleavage, very cobbly-Loncan association), and 576 (Sumine-Cleavage-Hapgood association) are on mountains; unit 511 (Dacker-Gance-Kelk association) is on fan piedmont remnants and inset fans; unit 110 (Moranch-Ocala-Orovada association) is on fan skirts; and unit 440 (Devilsgait-Woofus-Devilsgait, gravelly substratum association) is on basin floors (Soil Survey of Elko County, Nevada, Central Part; November 1997).
The physiographic position of each major soil component in some detailed soil map units. Units 261 (Linkup-Roca-Vanwyper association), 241 (Cleavage-Cleavage, very cobbly-Loncan association), and 576 (Sumine-Cleavage-Hapgood association) are on mountains; unit 511 (Dacker-Gance-Kelk association) is on fan piedmont remnants and inset fans; unit 110 (Moranch-Ocala-Orovada association) is on fan skirts; and unit 440 (Devilsgait-Woofus-Devilsgait, gravelly substratum association) is on basin floors (Soil Survey of Elko County, Nevada, Central Part; November 1997).
Appearance of some detailed soil map units as they occur in various positions on the landscape (Soil Survey of Lander County, Nevada, South Part; November 1991).
Landscape positions of each major soil component identified within the respective map units (Soil Survey of Lander County, Nevada, South Part; November 1991).
General soil map units representative of those on a bolson that is an internally drained intermontane basin. These units are 1—Payas; 6—Jerval-Dun Glen-Tenabo; 11—Reluctan-Roca-Iver; and 14—Puffer-Mulhop-Xine (Soil Survey of Pershing County, Nevada, East Part; May 1994).
General soil map units representative of those on a semibolson that is an externally drained intermontane basin. These units are 4—Humboldt-Sonoma-Sondoa; 6—Jerval-Dun Glen-Tenabo; 7—Chiara-Cortez-Orovada; 8—Jerval-Misad-Knoss; 9—Theon-Singatse; 10—Trunk-Burrita-Hoot; and 11—Reluctan-Roca-Iver (Soil Survey of Pershing County, Nevada, East Part; May 1994).
The physiographic position of various detailed soil map units. These units are 233—Dun Glen very fine sandy loam, 0 to 2 percent slopes; 322—Humboldt silty clay loam, strongly saline-sodic; 652—Burrita-Hoot-Rock outcrop association; 663—Oxcorel-Weso-Beoska association; 901—Roca-Reluctan association; and 1291—Slaven-Iver-Cleavage association (Soil Survey of Pershing County, Nevada, East Part; May 1994).
The physiographic position of various detailed soil map units. These units are 233—Dun Glen very fine sandy loam, 0 to 2 percent slopes; 322—Humboldt silty clay loam, strongly saline-sodic; 652—Burrita-Hoot-Rock outcrop association; 663—Oxcorel-Weso-Beoska association; 901—Roca-Reluctan association; and 1291—Slaven-Iver-Cleavage association (Soil Survey of Pershing County, Nevada, East Part; May 1994).
Map Units
Map units containing ROCA as a major component. Limited to 250 records.
Approximate geographic distribution of the ROCA soil series. To learn more about how this distribution was mapped, or to compare this soil series extent to others, use the Series Extent Explorer (SEE) application.
Source: generalization of SSURGO geometry (updated 2023-10-04).
